A researcher wanted to see whether dogs showed a preference among 4 types of treats. To test that, the researcher collected a sample of 88 dogs and presented each cat with the 4 types of treats, and permitted each participant to choose one type of treats. The researcher recorded the dogs' choices. a. Complete the following expected frequencies table. (4 points) Expected frequencies Treat A Treat B Treat C Treat D b. The observed frequencies were as follows: Observed frequencies Treat A Treat B Treat C Treat D 21 16 26 25 Based on this, calculate 2 (Chi-square). (6 points)